Question Lag in roblox with good cpu and gpu even in low settings

Aug 10, 2019
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Hello, i have low fps and lag spikes with these components in roblox(in other games i get the fps that it is suposed to).
In simple games in roblox i get 40-50 fps with lag spikes to 20 fps or something like that.

CPU:
AMD Phenom II X4 945
GPU:
Nvidia GTX 770
RAM:
8gb ddr2 1066mhz dual channel
MB:
ASRock N61P-S
(Internet is conected with cable, not wifi)

When i enable the option to see the graphics with the resources i see this:
Sin_titulo-1.png


When the game gives lag spike , the cpu graphic makes a red ''Tower''. It gets from 10ms~ to 120ms. And the cpu isn't at 100% when it lags.
If you need more information i can send it.

If you know how to fix this please help me.

Sorry if my english is not very good, because i dont use it that much.